Open source wireless power technology

impedance

Hello, I will explain how I matched input impedance of the WPT coil to 50 Ohm. Please look at the following picture. You can see that SMA cable is directly connected with the feed coil. Let’s see the frequency characteristic properties of this WPT coil. Frequency range is between 1 MHz and 27 MHz. So the center frequency is 14 MHz (=0.5*(1+27) MHz) that is the resonant frequency of this…

Hello. I will explain how to measure and decide lumped elements values for WPT coil. Here is the WPT coil that I made for my experiments. The WPT coil consists of a resonant coil and a feed coil with SMA connector. The resonant coil is spiral and has parasitic capacitance between the spiral lines and this capacitance make this coil resonate at LC resonant frequency. The feed coil is a…

I built a rectifier circuit for WPT project. This rectifier is used at receiver to convert AC from the coil to DC. Here are the pictures and the circuit diagram. Please look at the R1 in left side. The R1 is need to match the impedance of the system. The value should be 50 Ohm, But I use 47 Ohm instead here because of the simplicity of the circuit. The…